Is my friend crazy or not?!

Well, Her name is Sarah which backwards means Haras and that as a start is already scaring me. She's proud of her horror movie, knife, and hair collections. She says the hair is dolls hair but she doesn't have any dolls and I'm pretty sure that one of the locks of hair is mine. Sometimes in class I'll look over at her and she'll be staring at me weird so i try to out weird her, but she always wins. She's the scariest girl i know. Should I be scared?